Best Hygrometers for Monitoring Humidity
You cannot manage what you cannot measure. A hygrometer shows the relative humidity in a room, so you can see when the air is getting too damp and act — by ventilating, running a dehumidifier or drying laundry differently — before condensation and mould take hold.
They are cheap, and in a flat prone to damp they are one of the most useful few pounds you can spend. Here are the types worth buying and our picks.
QUICK ANSWER
A hygrometer shows your room’s humidity so you know when to ventilate or run a dehumidifier. A basic digital hygrometer is enough for most people (aim to keep rooms at 40–60%); a smart Bluetooth model logs trends and can alert you when humidity climbs.
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Who this guide is for
Anyone in a damp-prone flat who wants to keep an eye on humidity and catch problems early — renters and owners alike.
Our picks at a glance
| Pick | Best for |
|---|---|
| ThermoPro TP49 Digital Hygrometer | A simple, cheap humidity readout |
| Govee Bluetooth Hygrometer | Tracking humidity trends and getting alerts |
| SwitchBot Meter | Monitoring several rooms from one app |
Our picks in detail
BEST BASIC — ThermoPro TP49 Digital Hygrometer
Best for: A simple, cheap humidity readout
A tiny digital display showing temperature and humidity at a glance, with a comfort indicator. Cheap enough to put one in every room.
Pros: Very cheap, clear display, tiny.
Cons: No logging or phone alerts.
BEST SMART — Govee Bluetooth Hygrometer
Best for: Tracking humidity trends and getting alerts
Connects to your phone to log humidity over time and can alert you when it rises too high — useful for spotting a damp problem before you can see it.
Pros: App logging, high/low alerts, accurate.
Cons: Needs the app for the full benefit.
BEST FOR MULTIPLE ROOMS — SwitchBot Meter
Best for: Monitoring several rooms from one app
Compact smart sensors you can place around the flat and read from a single app, handy if damp shows up in more than one room.
Pros: Cheap per unit, app view, expandable.
Cons: Best value bought as a set.
Prices and availability on Amazon are accurate as of the date of publication and are subject to change.
How to choose
- Healthy range: aim to keep rooms around 40–60% relative humidity.
- Accuracy: cheap units are fine for spotting trends; do not expect lab precision.
- Placement: keep it away from windows, radiators and the kitchen for a fair reading.
- Logging: a smart model shows how humidity changes through the day.
- Alerts: useful to catch a damp room before mould appears.
- How many: one per problem room is ideal; they are cheap enough to spread around.
Common questions
What humidity is healthy for a flat?
Around 40–60% relative humidity is a good target. Below that can feel dry; above 60% for long periods encourages condensation and mould.
What is the difference between a hygrometer and a moisture meter?
A hygrometer measures humidity in the air; a moisture meter measures how wet a wall, floor or piece of wood is. For damp problems it is worth having both.
Where should I put a hygrometer?
Somewhere representative of the room — away from windows, radiators, extractor fans and the cooker, which would skew the reading.
How many hygrometers do I need?
One in each room that tends to get damp — often the bedroom and bathroom area. They are cheap, so it is easy to monitor a few rooms at once.
Our recommendation
For most people a ThermoPro TP49 in each problem room is all you need. If you want to track trends and get alerts, the Govee Bluetooth Hygrometer is worth the small step up; for several rooms, SwitchBot sensors are handy.
